At this grade level, many students are just beginning to develop an idea about what constitutes a convincing argument. The first solution—cutting and pasting in a disorganized way—does not make use of the properties of the two shapes and therefore may not convince the student doing the cutting and pasting or other students that the areas are equal. The second solution takes into consideration geometric relationships between the particular triangle and rectangle and therefore may be more » convincing. The third solution is the beginning of a logical analysis of the relationships among the shapes—that halves of equal areas must be equal to each other.